I'm attempting to use a lucene index in a neo4j 2.0.1 database to do a fuzzy query for particular terms in the name property of nodes. When executing these queries, although the lucene syntax looks OK, it fails with a mysterious NullPointerException. It could be that I've made some straightforward mistake in the lucene syntax, but how can I discover what that is?
String query = "start n=node:node_auto_index({searchCriteria}) "+
"match (n:Provenance) " +
"return n " +
"order by n.created desc " +
"limit 10";
String expr = term;
if(term.contains(" ") || term.contains("\t"))
expr = "\"" + term + "\"";
expr = "'name:" + expr + "~'";
log.info("search expression=" + expr);
Map<String,Object>params = new HashMap();
params.put("searchCriteria", expr);
When this method is run with an argument of "track", the output is this:
INFO: search expression='name:track~'
java.lang.NullPointerException
at org.apache.lucene.util.SimpleStringInterner.intern(SimpleStringInterner.java:54)
at org.apache.lucene.util.StringHelper.intern(StringHelper.java:39)
at org.apache.lucene.index.Term.(Term.java:38)
at org.apache.lucene.queryParser.QueryParser.getFieldQuery(QueryParser.java:643)
at org.apache.lucene.queryParser.QueryParser.Term(QueryParser.java:1436)
at org.apache.lucene.queryParser.QueryParser.Clause(QueryParser.java:1319)
at org.apache.lucene.queryParser.QueryParser.Query(QueryParser.java:1275)
at org.apache.lucene.queryParser.QueryParser.TopLevelQuery(QueryParser.java:1234)
at org.apache.lucene.queryParser.QueryParser.parse(QueryParser.java:206)
at org.neo4j.index.impl.lucene.IndexType.query(IndexType.java:303)
at org.neo4j.index.impl.lucene.LuceneIndex.query(LuceneIndex.java:251)
at org.neo4j.index.impl.lucene.LuceneIndex.query(LuceneIndex.java:263)
at org.neo4j.kernel.impl.coreapi.AbstractAutoIndexerImpl$ReadOnlyIndexToIndexAdapter.query(AbstractAutoIndexerImpl.java:249)
at org.neo4j.cypher.internal.spi.v2_0.TransactionBoundExecutionContext$NodeOperations.indexQuery(TransactionBoundExecutionContext.scala:166)
at org.neo4j.cypher.internal.compiler.v2_0.spi.DelegatingOperations.indexQuery(DelegatingQueryContext.scala:113)
at org.neo4j.cypher.internal.compiler.v2_0.spi.ExceptionTranslatingQueryContext$ExceptionTranslatingOperations.org$neo4j$cypher$internal$compiler$v2_0$spi$ExceptionTranslatingQueryContext$ExceptionTranslatingOperations$$super$indexQuery(ExceptionTranslatingQueryContext.scala:142)
at org.neo4j.cypher.internal.compiler.v2_0.spi.ExceptionTranslatingQueryContext$ExceptionTranslatingOperations$$anonfun$indexQuery$1.apply(ExceptionTranslatingQueryContext.scala:142)
at org.neo4j.cypher.internal.compiler.v2_0.spi.ExceptionTranslatingQueryContext$ExceptionTranslatingOperations$$anonfun$indexQuery$1.apply(ExceptionTranslatingQueryContext.scala:142)
at org.neo4j.cypher.internal.compiler.v2_0.spi.ExceptionTranslatingQueryContext.org$neo4j$cypher$internal$compiler$v2_0$spi$ExceptionTranslatingQueryContext$$translateException(ExceptionTranslatingQueryContext.scala:149)
at org.neo4j.cypher.internal.compiler.v2_0.spi.ExceptionTranslatingQueryContext$ExceptionTranslatingOperations.indexQuery(ExceptionTranslatingQueryContext.scala:142)
at org.neo4j.cypher.internal.compiler.v2_0.spi.DelegatingOperations.indexQuery(DelegatingQueryContext.scala:113)
at org.neo4j.cypher.internal.compiler.v2_0.executionplan.builders.EntityProducerFactory$$anonfun$2$$anonfun$applyOrElse$2.apply(EntityProducerFactory.scala:66)
at org.neo4j.cypher.internal.compiler.v2_0.executionplan.builders.EntityProducerFactory$$anonfun$2$$anonfun$applyOrElse$2.apply(EntityProducerFactory.scala:64)
at org.neo4j.cypher.internal.compiler.v2_0.executionplan.builders.EntityProducerFactory$$anon$1.apply(EntityProducerFactory.scala:35)
at org.neo4j.cypher.internal.compiler.v2_0.executionplan.builders.EntityProducerFactory$$anon$1.apply(EntityProducerFactory.scala:34)
at org.neo4j.cypher.internal.compiler.v2_0.pipes.StartPipe$$anonfun$internalCreateResults$1.apply(StartPipe.scala:34)
at org.neo4j.cypher.internal.compiler.v2_0.pipes.StartPipe$$anonfun$internalCreateResults$1.apply(StartPipe.scala:33)
at scala.collection.Iterator$$anon$13.hasNext(Iterator.scala:371)
at scala.collection.Iterator$$anon$14.hasNext(Iterator.scala:388)
at scala.collection.Iterator$$anon$11.hasNext(Iterator.scala:327)
at scala.collection.Iterator$class.isEmpty(Iterator.scala:256)
at scala.collection.AbstractIterator.isEmpty(Iterator.scala:1157)
at org.neo4j.cypher.internal.compiler.v2_0.pipes.TopPipe.internalCreateResults(TopPipe.scala:42)
at org.neo4j.cypher.internal.compiler.v2_0.pipes.PipeWithSource.createResults(Pipe.scala:71)
at org.neo4j.cypher.internal.compiler.v2_0.pipes.PipeWithSource.createResults(Pipe.scala:68)
at org.neo4j.cypher.internal.compiler.v2_0.executionplan.ExecutionPlanBuilder.org$neo4j$cypher$internal$compiler$v2_0$executionplan$ExecutionPlanBuilder$$prepareStateAndResult(ExecutionPlanBuilder.scala:149)
at org.neo4j.cypher.internal.compiler.v2_0.executionplan.ExecutionPlanBuilder$$anonfun$2.apply(ExecutionPlanBuilder.scala:126)
at org.neo4j.cypher.internal.compiler.v2_0.executionplan.ExecutionPlanBuilder$$anonfun$2.apply(ExecutionPlanBuilder.scala:125)
at org.neo4j.cypher.internal.compiler.v2_0.executionplan.ExecutionPlanBuilder$$anon$6.execute(ExecutionPlanBuilder.scala:50)
at org.neo4j.cypher.internal.ExecutionPlanWrapperForV2_0.execute(CypherCompiler.scala:93)
at org.neo4j.cypher.ExecutionEngine.execute(ExecutionEngine.scala:61)
at org.neo4j.cypher.ExecutionEngine.execute(ExecutionEngine.scala:65)
at org.neo4j.cypher.javacompat.ExecutionEngine.execute(ExecutionEngine.java:78)
at org.mitre.provenance.db.neo4j.Neo4JStorage.execute(Neo4JStorage.java:1216)
